Make filtered MemoryHabitLists update automatically

uhabits-android/src/androidTest/java/org/isoron/uhabits/models/sqlite/SQLiteHabitListTest.java

@@ -37,6 +37,8 @@ import java.util.*;
 
 import static org.hamcrest.MatcherAssert.*;
 import static org.hamcrest.core.IsEqual.*;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
 
 @SuppressWarnings("JavaDoc")
 @RunWith(AndroidJUnit4.class)
@@ -52,6 +54,8 @@ public class SQLiteHabitListTest extends BaseAndroidTest
 
     private SQLiteRepository<HabitRecord> repository;
 
+    private ModelObservable.Listener listener;
+
     @Override
     public void setUp()
     {
@@ -78,6 +82,16 @@ public class SQLiteHabitListTest extends BaseAndroidTest
         }
 
         habitList.reload();
+
+        listener = mock(ModelObservable.Listener.class);
+        habitList.getObservable().addListener(listener);
+    }
+
+    @Override
+    protected void tearDown() throws Exception
+    {
+        habitList.getObservable().removeListener(listener);
+        super.tearDown();
     }
 
     @Test
@@ -85,6 +99,8 @@ public class SQLiteHabitListTest extends BaseAndroidTest
     {
         Habit habit = modelFactory.buildHabit();
         habitList.add(habit);
+        verify(listener).onModelChange();
+
         exception.expect(IllegalArgumentException.class);
         habitList.add(habit);
     }

uhabits-android/src/main/java/org/isoron/uhabits/models/sqlite/SQLiteHabitList.java

@@ -92,6 +92,8 @@ public class SQLiteHabitList extends HabitList
         record.copyFrom(habit);
         record.position = list.indexOf(habit);
         repository.save(record);
+
+        getObservable().notifyListeners();
     }
 
     @Override
@@ -177,20 +179,21 @@ public class SQLiteHabitList extends HabitList
             repository.remove(record);
         });
         rebuildOrder();
+        getObservable().notifyListeners();
     }
 
     @Override
     public synchronized void removeAll()
     {
-        loadRecords();
         list.removeAll();
         SQLiteDatabase db = DatabaseUtils.openDatabase();
         db.execSQL("delete from habits");
         db.execSQL("delete from repetitions");
+        getObservable().notifyListeners();
     }
 
     @Override
-    public synchronized void reorder(Habit from, Habit to)
+    public synchronized void reorder(@NonNull Habit from, @NonNull Habit to)
     {
         loadRecords();
         list.reorder(from, to);
@@ -222,6 +225,7 @@ public class SQLiteHabitList extends HabitList
         fromRecord.position = toPos;
         repository.save(fromRecord);
         update(from);
+
         getObservable().notifyListeners();
     }
 
@@ -251,6 +255,8 @@ public class SQLiteHabitList extends HabitList
             record.copyFrom(h);
             repository.save(record);
         }
+
+        getObservable().notifyListeners();
     }
 
     public void reload()